feat: Add placeholder support for Windows #386
Merged
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This change brings parity with the react-native-windows 0.63 Picker implementation of not setting a default index for the picker:
https://github.com/microsoft/react-native-windows/blob/0.63-stable/vnext/Microsoft.ReactNative/Views/PickerViewManager.cpp#L40
If we don't set the index to -1 (or due to defaulting to 0) the place holder text won't appear otherwise
https://docs.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.combobox.placeholdertext?view=winrt-22000#remarks
This change also adds placeholder text support for Windows only + an example to use it.